View source for Scirpus georgianus

{{Treatment/ID
|accepted_name=Scirpus georgianus
|accepted_authority=R. M. Harper
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=27: 331. 1900
|year=1900
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Scirpus atrovirens var. georgianus
|authority=(R. M. Harper) Fernald
|rank=variety
}}
|hierarchy=Cyperaceae;Scirpus;Scirpus georgianus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cyperaceae]]</div><div class="higher-taxon"><small>genus</small>[[Scirpus]]</div><div class="higher-taxon"><small>species</small>[[Scirpus georgianus]]</div></div>
|volume=Volume 23
|mention_page=page 5, 10, 11, 12, 15
|treatment_page=page 13
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>cespitose; rhizomes short, tough, fibrous. <b>Culms</b>: fertile ones upright or reclining; nodes without axillary bulblets. <b>Leaves</b> 6–12 per culm; sheaths of proximal leaves green or brownish; proximal sheaths and blades with septa few to many, usually not conspicuous; blades 19–50 cm × 6–13 mm. <b>Inflorescences</b> terminal; rays ascending or divaricate (often both in the same inflorescence), proximal branches smooth, distal branches scabrous or scabrellous, rays often bearing axillary bulblets; bases of involucral bracts green, margins brown or at least speckled with red-brown, not glutinous. <b>Spikelets</b> in clusters of 4–35 (largest cluster with 16 or more), spikelets sessile, ovoid, 2–4 × 1–2 mm; scales brown or blackish brown with pale midribs, elliptic, 1–1.8 mm, apex mucronate, mucro 0.1–0.3 mm. <b>Flowers</b>: perianth bristles persistent when present, 0–3, slender, straight or curved, much shorter than (rarely to 0.7 times as long as) achene, smooth or rarely with round-tipped, retrorse teeth near apex, enclosed within scales; styles 3-fid. <b>Achenes</b> pale brown to almost white, elliptic or obovate in outline, plumply trigonous or plano-convex, 0.6–1.2 × 0.4–0.5 mm. <b>2n</b> = 50, 52, 54.</span><!--

-->{{Treatment/Body
|phenology=Fruiting late spring–early summer (Jun–Jul).
|habitat=Moist meadows, marshes, ditches
|elevation=0–600 m
|distribution=Ont.;P.E.I.;Ala.;Ark.;Conn.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Minn.;Miss.;Mo.;Nebr.;N.H.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.;New Zealand.
|introduced=true
|discussion=<p>In the northern part of its range, <i>Scirpus georgianus</i> occurs in disjunct localities. It is found as far north as Prince Edward Island; it seldom grows in New England. It is unknown from Michigan; it occurs in northern Wisconsin. The species is probably a recent introduction in at least some of these disjunct localities. Most old reports of <i>S. atrovirens</i> var. georgianus from the northeastern United States and eastern Canada are based on specimens of <i>S. hattorianus</i>.</p><!--
--><p>The three cytotypes of <i>Scirpus georgianus</i> are identical morphologically; they seem to occur in slightly different habitats (A. E. Schuyler 1976).</p><!--
--><p><i>Scirpus georgianus</i> is distinctive in having the perianth bristles absent or rudimentary (seldom more than 0.2 times as long as achene and usually smooth). Rarely, a few achenes will be found with bristles up to 0.75 times as long as achene and with a few barbs near the tip. Such plants have been confused with <i>S. hattorianus</i> in the past. <i>Scirpus georgianus</i> differs in having fewer bristles (never more than three per achene, and usually only one well developed) and in the bristles either being smooth or having the barbs confined to the extreme tip. In addition, <i>S. georgianus</i> differs from <i>S. hattorianus</i> in having less black pigmentation in the scales (thus the heads tend to appear brownish, not blackish).</p><!--
--><p>In <i>Scirpus georgianus</i>, as in other species of <i>Scirpus</i>, the filaments often persist long after the anthers have been shed, and specimens of <i>S. georgianus</i> are sometimes misnamed because the filaments are mistaken for perianth bristles. Only three filaments per flower occur and they are thicker than the bristles and never toothed or barbed.</p><!--
--><p><i>Scirpus georgianus</i> occasionally hybridizes with <i>S. atrovirens</i> and <i>S. hattorianus</i>.</p><!--
--><p><i>Scirpus georgianus</i>, <i>S. flaccidifolius</i>, <i>S. hattorianus</i>, <i>S. atrovirens</i>, and <i>S. pallidus</i> differ only in minute characteristics, and it may be necessary to compare specimens of them in order to make reliable identifications. Despite their close morphologic similarities, their characteristics are reasonably consistent even in areas where they coexist and occasionally hybridize.</p>
|tables=
|references=
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-->{{#Taxon:
name=Scirpus georgianus
|authority=R. M. Harper
|rank=species
|parent rank=genus
|synonyms=Scirpus atrovirens var. georgianus
|basionyms=
|family=Cyperaceae
|phenology=Fruiting late spring–early summer (Jun–Jul).
|habitat=Moist meadows, marshes, ditches
|elevation=0–600 m
|distribution=Ont.;P.E.I.;Ala.;Ark.;Conn.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Minn.;Miss.;Mo.;Nebr.;N.H.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.;New Zealand.
|introduced=true
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1900
|special status=Illustrated;Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V23/V23_6.xml
|genus=Scirpus
|species=Scirpus georgianus
}}<!--

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